gdb/testsuite/gdb.dwarf2/dw2-symtab-includes-lookup.exp

# Copyright 2021-2022 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Lookup a type in a partial unit with DW_AT_stmt_list.
#
# The test-case is setup such that the partial symtab expansion route is
# .h partial symtab -> shared partial symtab -> toplevel symtab.
#
# That is, the partial symtabs (as displayed by maint print objfiles) are:
#
#   ../sysdeps/x86_64/crtn.S at 0x3d944e0^M
#   elf-init.c at 0x3d94440^M
#   dw2-symtab-includes.h at 0x3d7c7a0^M
#   <unknown> at 0x31ef870^M
#   bla.c at 0x33985f0^M
#   ../sysdeps/x86_64/crti.S at 0x33e9a00^M
#   init.c at 0x33fa600^M
#   ../sysdeps/x86_64/start.S at 0x33f3fd0^M
#
# and the expansion of dw2-symtab-includes.h triggers the expansion of its
# includer <unknown>, which triggers expansion of user bla.c.
#
# The problem in PR28539 was that after expansion of dw2-symtab-includes.h
# the expansion_notify function in psymbol_functions::expand_symtabs_matching
# should be called with the bla.c symtab, but instead it got called with
# nullptr, which caused a segfault.

load_lib dwarf.exp

# This test can only be run on targets which support DWARF-2 and use gas.
require dwarf2_support 1

standard_testfile main.c .S

# Create the DWARF.
set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
    declare_labels partial_label lines_label
    global srcdir subdir srcfile

    cu {} {
	partial_label: partial_unit {
	    {stmt_list ${lines_label} DW_FORM_sec_offset}
	} {
	    DW_TAG_base_type {
		{DW_AT_byte_size 4 DW_FORM_sdata}
		{DW_AT_encoding  @DW_ATE_signed}
		{DW_AT_name      myint}
	    }
	}
    }

    cu {} {
	compile_unit {
	    {language @DW_LANG_C}
	    {DW_AT_name bla.c}
	} {
	    imported_unit {
		{import $partial_label ref_addr}
	    }
	}
    }

    lines {version 2} lines_label {
	include_dir "${srcdir}/${subdir}"
	file_name "dw2-symtab-includes.h" 1
	program {
	    DW_LNS_advance_line 1
	}
    }
}

if { [prepare_for_testing "failed to prepare" $testfile \
	  "${asm_file} ${srcfile}" {}] } {
    return -1
}

# Check that no symtabs are expanded.
set test "no symtabs expanded"
if { [readnow] } {
    unsupported $test
} else {
    gdb_test_no_output "maint info symtabs" $test
}

# Lookup myint.  Regression test for PR28539.
gdb_test "ptype myint" "type = myint"